Fuel Cutoff Mode

The PCM has the ability to shut OFF the fuel injectors completely or selectively when certain conditions are met. This fuel shut off mode allows the powertrain to protect itself from damage and also improve its driveability.

The PCM will disable the injectors under the following conditions:

1. Ignition OFF (prevents engine run-on).
2. Ignition ON but no ignition reference signal (prevents flooding or backfiring).
3. High engine speed (above red line).
4. High vehicle speed (above rated tire speed).
5. Extended high speed closed throttle coast-down (reduce emissions and increases engine braking).

IMPORTANT: These RPM cut off ranges may vary according to PCM calibration, axle ratio, tire size, and tire rating.

Fuel RPM cut off ranges:
^ Park and neutral - 4000 RPM The PCM reduces the amount of fuel injected when it detects a decrease in throttle position and air flow. When deceleration is very fast, the PCM may cut off fuel completely for short periods.
^ Reverse - 4000 RPM
^ Drive - 5950 RPM